patch file name

modules/subtitle_manager.py

@@ -120,4 +120,13 @@ def get_serialized_vtt(dicts):
 
 def safe_filename(name):
     INVALID_FILENAME_CHARS = r'[<>:"/\\|?*\x00-\x1f]'
-    return re.sub(INVALID_FILENAME_CHARS, '_', name)
+    safe_name = re.sub(INVALID_FILENAME_CHARS, '_', name)
+    # Truncate the filename if it exceeds the max_length (20)
+    if len(safe_name) > 20:
+        file_extension = safe_name.split('.')[-1]
+        if len(file_extension) + 1 < 20:
+            truncated_name = safe_name[:20 - len(file_extension) - 1]
+            safe_name = truncated_name + '.' + file_extension
+        else:
+            safe_name = safe_name[:20]
+    return safe_name